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2 edition of Atmospheric chemistry of hydrofluorocarbons and hydrochlorofluorocarbons found in the catalog.

Atmospheric chemistry of hydrofluorocarbons and hydrochlorofluorocarbons

Jens Sehested

Atmospheric chemistry of hydrofluorocarbons and hydrochlorofluorocarbons

by Jens Sehested

  • 319 Want to read
  • 33 Currently reading

Published by Risø National Laboratory in Roskilde, Denmark .
Written in English

    Subjects:
  • Halocarbons.

  • Edition Notes

    StatementJens Sehested.
    SeriesRisø-R-804(EN)
    ContributionsRisø National Laboratory.
    The Physical Object
    Pagination207p. :
    Number of Pages207
    ID Numbers
    Open LibraryOL21677026M
    ISBN 108755020658

    We use a two-dimensional atmospheric transport model to simulate global atmospheric abundances and to estimate global emissions. HFCmfc and HFCfa first appeared in the atmosphere only ∼1 decade ago; they have grown rapidly to globally averaged dry air mole fractions of ppt (in parts per trillion, 10−12) and ppt. Organofluorine chemistry describes the chemistry of the organofluorines, organic compounds that contain the carbon–fluorine fluorine compounds find diverse applications ranging from oil and water repellents to pharmaceuticals, refrigerants, and reagents in addition to these applications, some organofluorine compounds are pollutants because of their .

    The results are discussed with regard to the environmental impact of CF3CF=CH2 and the atmospheric chemistry of unsaturated fluorinated hydrocarbons. Discover the world's research 16+ million members. One of the substitutes developed by industry, the hydrochlorofluorocarbons (HCFCs), still contain enough chlorine to interfere with atmospheric ozone chemistry, although in much lesser amounts than CFCs. The Copenhagen amendment to the Montreal Protocol calls for the cessation of HCFC production by Hydrofluorocarbons (HFCs) are currently.

    In order to assess the health and environmental effects of a chemical, you need to determine the exposure of the chemical to sensitive organisms as well as to assess the likely effects. The chemicals in Volume V of the Handbook of Environmental Fate and Exposure Data for Organic Chemicals set are mostly solvents and cover many of the natural products and . High-frequency, in situ global observations of HCFC (CHClF 2), HCFCb (CH 3 CCl 2 F), HCFCb (CH 3 CClF 2) and HCFC (CHClFCF 3) and their main HFC replacements, HFCa (CH 2 FCF 3), HFC (CHF 2 CF 3), HFCa (CH 3 CF 3) and HFC (CH 2 F 2), have been used to determine their changing global growth rates and emissions in response to .


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Atmospheric chemistry of hydrofluorocarbons and hydrochlorofluorocarbons by Jens Sehested Download PDF EPUB FB2

Barbara J. Finlayson-Pitts, James N. Pitts Jr., in Chemistry of the Upper and Lower Atmosphere, e. CFCs, HCFCs, and HFCs. The atmospheric concentrations of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs) and the trends in these concentrations are discussed in detail in Chapter In brief, the atmospheric.

Hydrofluorocarbon (HFC), any of several organic compounds composed of hydrogen, fluorine, and carbon. HFCs became widely used as refrigerants in the late s, but their status as potent greenhouse gases led to their manufacture and use becoming increasingly regulated in the. Barbara J.

Finlayson-Pitts, James N. Pitts Jr., in Chemistry of the Upper and Lower Atmosphere, e. CFCs, HCFCs, and HFCs. The atmospheric concentrations of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs) and the trends in these concentrations are discussed in detail in Chapter In brief, the.

We review the available data concerning the atmospheric chemistry and environmental impact of a series of important hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs).

HFCs have no impact on stratospheric ozone. HCFCs have ozone depletion potentials which are times less than CFCs.

We measure infrared absorption spectra of 18 hydrochlorofluorocarbons and hydrofluorocarbons, seven of which do not yet appear in the literature. The spectra are used in a narrowband model of the terrestrial infrared radiation to calculate radiative forcing and global warming by: Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or partly halogenated paraffin hydrocarbons that contain only carbon (C), hydrogen (H), chlorine (Cl), and fluorine (F), produced as volatile derivative of methane, ethane, and are also commonly known by the DuPont brand name Freon.

The most common representative is. Wallington T.J., Nielsen O.J. () Atmospheric Chemistry and Environmental Impact of Hydrofluorocarbons (HFCs) and Hydrofluoroethers (HFEs).

In: Neilson A.H. (eds) Organofluorines. The Handbook of Environmental Chemistry (Vol. 3 Series: Anthropogenic Compounds), vol 3N. Springer, Berlin, Heidelberg. First Online 20 June Cited by: 7. One approach is to use hydrochlorofluorocarbons (HCFCs), hydrocarbons in which only some of the hydrogen atoms are replaced by chlorine or fluorine, and hydrofluorocarbons (HFCs), which do not contain chlorine (Table "Selected HCFCs and HFCs").

The C–H bonds in HCFCs and HFCs act as “handles” that permit additional chemical reactions. Get this from a library. Atmospheric chemistry and physics: from air pollution to climate change. [John H Seinfeld; Spyros N Pandis] -- A detailed account of the chemistry and physics of the atmosphere - for graduate students, professionals and libraries involved in environmental, civil and chemical engineering projects and studies.

Hydrofluorocarbons (HFCs) are organic compounds that contain fluorine and hydrogen atoms, and are the most common type of organofluorine are gases at room temperature and pressure.

They are frequently used in air conditioning and as refrigerants, Ra was one of the most commonly used HFC refrigerants, in place of the older. Hydrofluorocarbons (HFCs) are man-made greenhouse gases. They were developed to replace ozone-depleting gases found in a variety of applications, including refrigeration systems, aerosol propellants, and fire suppression.

Tropospheric Chemistry of CFC Replacements: Hydrofluorocarbons (HFCs) and Hydrochlorofluorocarbons (HCFCs) Atmospheric Chemistry of Mercury Appendix 6 Organic Functional Groups Earth's atmosphere is made up of regions, classified by the vertical trends in temperature ().The stratosphere, where most of the atmospheric ozone resides (see Box ), extends from ~10 to 50 km above the spheric ozone is important because it absorbs much of the intense ultraviolet (UV) radiation from the sun, dissociating into O 2 and O.

Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and halons destroy the earth's protective ozone layer, which shields the earth from harmful ultraviolet (UV-B) rays generated from the sun. CFCs and HCFCs also warm the lower atmosphere of the earth, changing global climate.

Hydrofluorocarbons (HFCs) also act to warm the planet. Atmospheric Chemistry and Environmental Impact of Hydrofluorocarbons and Hydrochlorofluorocarbons / Timothy J. Wallington, William F. Schneider, Ole J. Nielsen, Jens Sehested, Douglas R.

Worsnop, W. De Bruyn and Jeffrey A. Shorter The Atmospheric Chemistry of Iodine Compounds / Robert E. Huie and Barna Laszlo   Atmospheric Chemistry and Physics, 3rd Edition is an ideal textbook for upper-level undergraduate and graduate students, as well as a reference for researchers in environmental and atmospheric science, chemistry, meteorology, and civil and environmental engineering.

show more/5(35). Hydrofluorocarbons Definition. by Laurent Cousineau (Montreal) Hydrofluorocarbons are compounds consisting of hydrogen, fluorine, and carbon atoms.

Also known as HFCs, hydrofluorocarbons were first introduced as alternatives to ozone depleting substances that were used for commercial, personal, and industrial purposes.

Chlorofluorocarbons (CFC), Hydrochlorofluorocarbons (HCFC) and Hydrofluoro Carbons (HFC) are mainly used in refrigeration and foaming agents. CFC are Ozone depleting agents (ODS) and one of the main reasons for the depletion of Office, so HCFC wer.

Changing trends and emissions of hydrochlorofluorocarbons (HCFCs) and their hydrofluorocarbon (HFCs) replacements About 79 % of the total HCFC atmospheric burden in is HCFC, where global emissions appear to have been relatively similar sincein spite of the cap on emissive uses.

Atmospheric Chemistry and Physics. Say. Abstract. This chapter provides an overview of the atmospheric photochemical degradation of important anthropogenic molecules. Starting with an introduction to atmospheric chemistry, the concept of atmospheric lifetime is presented and the degradation mechanisms of alkanes, aromatics, nitrogen oxides, SO 2, chlorofluorocarbons, halons, hydrofluorocarbons, and Cited by: 3.

Hydrochlorofluorocarbons. Hydrochlorofluorocarbons (HCFCs) are compounds made up of hydrogen, chlorine, fluorine, and carbon atoms.

HCFCs and their cousins, hydrofluorocarbons (HFCs), were created in the s as substitutes for chlorofluorocarbons (CFCs) for .Chlorofluorocarbons, hydrochlorofluorocarbons, and hydrofluorocarbons in the atmosphere of four Chinese cities Article in Atmospheric Environment –91 August with Reads.

1. Sci Total Environ. Feb 1; doi: /env Epub Nov 2. Estimated emissions of chlorofluorocarbons, hydrochlorofluorocarbons, and hydrofluorocarbons based on an interspecies correlation method in the Pearl River Delta region, by: